A 50-cm x 30-cm x 20-cm block weighing W is to be moved at a constant velocity of 0.80 m/s on an inclined surface with a friction coefficient of 0.27. (a) Determine the force F that needs to be applied in the horizontal direction. (b) If a t-mm-thick oil film with a dynamic viscosity of 0.012 Pa•s is applied between the block and inclined surface, determine the percent reduction in the required force. V = 0.8 m/s 50 cm 30 cm F 20° W t (mm) W (N) 200 0.35

A 50-cm x 30-cm x 20-cm block weighing W is to be moved at a constant velocity of 0.80 m/s on an inclined surface with a friction coefficient of 0.27. (a) Determine the force F that needs to be applied in the horizontal direction. (b) If a t-mm-thick oil film with a dynamic viscosity of 0.012 Pa•s is applied between the block and inclined surface, determine the percent reduction in the required force. V = 0.8 m/s 50 cm 30 cm F 20° W t (mm) W (N) 200 0.35

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Properties of Fluids

The term fluid represents a type of substance that can easily change its shape under any external pressure/force and can flow. Fluids can acquire any shape in which it is stored and can resist normal stresses but cannot resist shear stress in rest condition. Whenever external shear stress is applied to fluids, it starts to flow. The fluids may be liquid or gas. Example- water, air, etc.

Question

A 50-cm x 30-cm x 20-cm block weighing W is to be moved at a constant velocity of 0.80 m/s on an
inclined surface with a friction coefficient of 0.27.
(a) Determine the force F that needs to be applied in the horizontal direction.
(b) If a t-mm-thick oil film with a dynamic viscosity of 0.012 Pa-s is applied between the block and
inclined surface, determine the percent reduction in the required force.
V = 0.8 m/s
50 cm
30 cm
F
20°
W
t (mm)
W (N)
0.35
200

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